Finding the Fourth Proportional to 259,401.69, 389,018.30 and 99,469.22

Step by Step Solution

1. Step 1: Write the proportion equation
   259,401.69 : 389,018.30 = 99,469.22 : x
2. Step 2: Convert to fraction form
   259,401.69/389,018.30 = 99,469.22/x
3. Step 3: Cross multiply
   259,401.69x = 389,018.30 × 99,469.22
4. Step 4: Simplify right side
   259,401.69x = 38,695,344,424.29
5. Step 5: Solve for x
   x = 38,695,344,424.29/259,401.69
6. Step 6: Final answer
   x = 149,171.52